并非所有的代码路径都返回值???

[yj05328]

我写了一个新闻读取的类，但是出现标题所出的问题。
这是我的详细代码：
前台：
<table border="1">
<tr><td style="width: 293px" runat="server" id="tt1"> </td></tr>
</table>
后台
protected void Page_Load(object sender, EventArgs e)
{
string str = "select top 5 * from news where type_ids=51 order by id desc";
access.yj(str,tt1);
}

调用的类：
public static string yj(string str,HtmlTableCell tt)
{
SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["GirlsysConnectionString"].ConnectionString);//连接数据库
try
{
conn.Open();
SqlCommand cmd = new SqlCommand(str, conn);
SqlDataReader dea = cmd.ExecuteReader();
while (dea.Read())
{
tt.InnerText +="<a href=\"news_look.aspx?id=" + dea["id"] + "\" target=_blank>" + access.Substr(dea["title"].ToString(), 0, 11);
return tt.InnerText;
}
}
catch
{
return tt.InnerText;
}
finally
{
conn.Close();
}
}
谢谢各位了

[sunxw18]

while (dea.Read())
{
tt.InnerText +=" <a href=\"news_look.aspx?id=" + dea["id"] + "\" target=_blank>" + access.Substr(dea["title"].ToString(), 0, 11);
return tt.InnerText;
}

如果while 里面没有执行，又没有出异常，就出问题了！

[kfps8kfps8]

这一句的位置不对！
return tt.InnerText;

[ppp7p]

public static string yj(string str,HtmlTableCell tt) 
    { 
        SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["GirlsysConnectionString"].ConnectionString);//连接数据库 
        try 
        { 
            conn.Open(); 
            SqlCommand cmd = new SqlCommand(str, conn); 
            SqlDataReader dea = cmd.ExecuteReader(); 
            while (dea.Read()) 
            { 
                tt.InnerText +=" <a href=\"news_look.aspx?id=" + dea["id"] + "\" target=_blank>" + access.Substr(dea["title"].ToString(), 0, 11); 
                return tt.InnerText; 
            } 
        } 
        catch 
        { 
            return tt.InnerText; 
        } 
        finally 
        { 
            conn.Close(); 
        } 
    } 

你最后再返回 return "";可以了，
一般你可以在最外面声明个变量把数据赋给这个变量，最后只返回这个变量就可以了。

[我姓区不姓区]

public static string yj(string str,HtmlTableCell tt)
{
SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["GirlsysConnectionString"].ConnectionString);// 连接数据库
try
{
conn.Open();
SqlCommand cmd = new SqlCommand(str, conn);
SqlDataReader dea = cmd.ExecuteReader();
while (dea.Read())
{
tt.InnerText +=" <a href=\"news_look.aspx?id=" + dea["id"] + "\" target=_blank>" + access.Substr(dea["title"].ToString(), 0, 11);

}
return tt.InnerText;
}
catch
{
return tt.InnerText;
}
finally
{
conn.Close();
}
}

[RHCL]

改:

public static string yj(string str,HtmlTableCell tt) 
    { 
        SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["GirlsysConnectionString"].ConnectionString);//连接数据库 
        try 
        { 
            conn.Open(); 
            SqlCommand cmd = new SqlCommand(str, conn); 
            SqlDataReader dea = cmd.ExecuteReader(); 
            while (dea.Read()) 
            { 
                tt.InnerText +=" <a href=\"news_look.aspx?id=" + dea["id"] + "\" target=_blank>" + access.Substr(dea["title"].ToString(), 0, 11); 
                           } 
        } 
        catch 
        { 
            //return tt.InnerText; 
        } 
        finally 
        { 
            conn.Close(); 
        } 
 return tt.InnerText; 

    }

[wo6522317]

你的代码写错了:
while (dea.Read())
{
tt.InnerText +=" <a href=\"news_look.aspx?id=" + dea["id"] + "\" target=_blank>" +access.Substr(dea["title"].ToString(), 0, 11);
return tt.InnerText;
}
应该是这样的吧:
while (dea.Read())
{
tt.InnerText +=" <a href=\"news_look.aspx?id=" + dea["id"] + "\" target=_blank>" +access.Substr(dea["title"].ToString(), 0, 11);
}
return tt.InnerText;

[bird1983]

public static string yj(string str,HtmlTableCell tt)
{
SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["GirlsysConnectionString"].ConnectionString);// 连接数据库
try
{
conn.Open();
SqlCommand cmd = new SqlCommand(str, conn);
SqlDataReader dea = cmd.ExecuteReader();
while (dea.Read())
{
tt.InnerText +=" <a href=\"news_look.aspx?id=" + dea["id"] + "\" target=_blank>" + access.Substr(dea["title"].ToString(), 0, 11);
return tt.InnerText;
}
return string.empty;
}
catch
{
return tt.InnerText;
}
finally
{
conn.Close();
}
}

[Tureno]

while (dea.Read()) 
            { 
                tt.InnerText +=" <a href=\"news_look.aspx?id=" + dea["id"] + "\" target=_blank>" + access.Substr(dea["title"].ToString(), 0, 11); 
                return tt.InnerText; 
            }

你这个while 中的return造成了这个错误，所以在编译的时候报这个错误。

6楼正解。
哎来晚了!!